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Vocab Chapter 7

TermDefinition
Pangaea All the continents were once part of a super-continent.
Continental Drift Suggested that continents are in constant motion on the surface of earth.
Mid-ocean ridge The mountain ranges in the middle of the oceans.
Seafloor spreading The process by which new oceanic crust forms along a mid-ocean ridge and older oceanic crust moves away from the ridge.
Normal polarity Magnetized objects such as compass needles.
Magnetic reversal magnetic field reverses direction.
Reversed polarity a state in which magnetized objects would reverse direction and orient themselves to point south.
plate tectonics Earths surface is made of rigid slabs of rock or plates that move with respect to each other.
lithosphere The cold and rigid outermost rock layer.
divergent plate boundary forms where 2 plates seperate.
transform plate boundary forms where 2 plates slide past each other.
convergent plate boundary forms where 2 plates collide.
subduction The denser plate sinks below the more buoyant plate.
convection The circulation of material caused by differences in temperature and density.
ridge push Rising mantle material at mid-ocean ridges creates the potential for plates to move away from the ridge.
slab pull As a slab sinks it pulls on the rest of the plate
Created by: Natalie .
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